microSD/SD Card Requirements:Make sure your device is compatible with this product before purchasing. View limitations with some marine mapping products.To view and use the maps on this card, you must have a device with a microSD/SD card slot. Maps on a microSD/SD card require a unit to be viewed on a computer with BaseCamp or HomePort, depending on the type of map.Reduced price map updates are not available for these cards. If you want to update the maps, you must purchase a new card that includes the latest map data.The microSD/SD card package includes a microSD card and a SD card adapter.